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fair_sched_class是完全公平调度类：
/* * All the scheduling class methods: */ const struct sched_class fair_sched_class = { .next = &idle_sched_class, .enqueue_task = enqueue_task_fair, .dequeue_task = dequeue_task_fair, .yield_task = yield_task_fair, .yield_to_task = yield_to_task_fair, .check_preempt_curr = check_preempt_wakeup, .pick_next_task = pick_next_task_fair, .put_prev_task = put_prev_task_fair, #ifdef CONFIG_SMP .select_task_rq = select_task_rq_fair, .migrate_task_rq = migrate_task_rq_fair, .rq_online = rq_online_fair, .rq_offline = rq_offline_fair, .task_dead = task_dead_fair, .set_cpus_allowed = set_cpus_allowed_common, #endif .set_curr_task = set_curr_task_fair, .task_tick = task_tick_fair, .task_fork = task_fork_fair, .prio_changed = prio_changed_fair, .switched_from = switched_from_fair, .switched_to = switched_to_fair, .get_rr_interval = get_rr_interval_fair, .update_curr = update_curr_fair, #ifdef CONFIG_FAIR_GROUP_SCHED .task_change_group = task_change_group_fair, #endif };
CFS调度类是索引普通进程的调度类，init进程的调度类就是CFS调度类。
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